Mapping my special keyboard

Here's the keyboard. I cannot find a way to map the FN key. I want to make it a control key. I've looked up the keysym from xmodmap, which appears to be "function". However after dumping xmodmap -pke -display :0>.Xmodmap I get this:

Please ignore all the lines with 'q q q q' and 'q q q a'. Just a test of mine.I've already tried filling every empty keycode with that to see if (after executing xmodmap .Xmodmap) the key responds. Which it doesn't.

More information required - distribution, device name etc. Then maybe someone will has some comments, although this appears to be more a general Linux question than Raspi specific so a Google search on the device might be useful.

Volunteer at the Raspberry Pi Foundation, helper at Picademy September, October, November 2014.